Continuous type lasting machine



OC- 16, 1951 J. s. KAMBORIAN CONTINUOUS TYPE LASTING MACHINE 3 Sheets-Sheet l Filed Dec. 20, 1947 efacq ma Oct. 16, 1951 J. s. KAMBoRlAN CONTINUOUS TYPE LASTING MACHINE C5 Sheets-Sheet 2 Filed Dec.' 20, 1947 jwerzar 0 ZM Ail/js.

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CONTINUOUS TYPE LSTING MACHINE Filed Dec. 20, 1947 5 Sheets-Sheet 3 Patented Oct. 16, V1951 UNITED STATES PATENTTOFFICE CONTINUOUS TYPE LAsTING MACHINE Jacob S. Kamborian, West Newton, Mass.A

Application December 29, 1947, serial No. 792,913

18 Claims. l

This invention pertains to shoe lasting machines, more especially to lasting machines of the continuous-lasting type, and in particular to certain improvements in means for wiping-in and setting the work in lasted-in condition.

Among the objects of the invention are to provide improved means for wiping-in the upper by a continuous uninterrupted action and in such a ,way that the upper is laid smoothly over upon the insole, not only at the shank and forepart but also at the ends of the shoe; and to provide improved means for setting the wiped-in upper material so that itretains its position and does not draw back when the in-wiping operation ceases. Other and further objects and advantages of the invention will be pointed out in the following more detailed description and by reference to the accompanying drawings wherein Fig. 1 is a fragmentary side elevation of a lasting machine embodying the present invention; I

Fig. 2 is a fragmentary front elevation of the machine illustrated in Fig. 1;

Fig. 3 is a fragmentary front elevation, to

larger scale, showing a relative position of the A.

shoe may be lasted by the use of the apparatus f herein disclosed.

The present invention relates to improvements in certain features of a lasting machine of the general type disclosed in the patent to Kamborian, No. 2,251,285, dated August 5, 1941, and these improvements are here illustrated as embodied in a machine having some of the characteristics of and which functions in the same general way as the machine of said patent.

The machine herein illustrated comprises a base I, preferably a hollow column housing a motor 2 and supporting the head or frame 3 which is provided with spaced bearings 4 and 5, respectively, for a horizontal shaft 6. A pulley l, xed to the rear end of the shaft 6, is embraced by a belt 8 which is driven by a pulley 9 on a shaft I0 turning in bearing brackets Il and I2 projecting from the left-hand side of the frame 3. Another pulley I3, fixed to the rear end of the shaft I0, is driven by a belt I4 rwhich embraces a pulley I5 (Fig. 2) on the shaft of the motor 2.

A carriage I6 slides in guideways in the forward part of the frame 3 so as to move from front to rear and is urged rearwardly by springs (not shown). Treadle actuated means (not shown) may be provided for moving the carriage I6 forwardly in orderto facilitate the introduction of the work between the feed rolls, hereinafter described, although the skilled operator is readily able to introduce the work between the feed rolls without first separating them by such forward movement of the carriage. I

The carriage I6 has bearings'for a rotatable shaft I1 (Fig. 4) whose axis is in a plane substantially parallel to the front of the machine, the axis ofthe shaft being inclined downwardly and to the left, that is to say, in the direction of advance of the work. As here illustrated, the axis of the shaft makes an angle of approximately 70 with the horizontal. A second shaft I8, whose axis is parallel with that of the shaft I1, is mounted in turn in bearings carried by the xed frame 3. These shafts I'I and I8 are rotated by means of gearing (not shown) actuated by the shaft 6. Suitable means for driving the shafts I'I and I8 in opposite directions regardless of the position of the carriage I6 is disclosed in the aforesaid patent to Kamborian, towhich reference may be had for a more detailed description of such a drive means.

To the lower end of the shaft I'I there is fixed a truncated upwardly tapering feed roll I9, and to the lower end of the shaft I8 there is fixed a truncated, downwardly tapering conical feed roll 20. Desirably these feed rolls have a taper of approximately 20, that is to say, an angle of 20 between a plane tangent to the peripheral surface of the roll and the axis ofthe roll. A desirable and useful diameter for the larger end of the Vroll I9 is 0.795". These rolls arev of complemental taper so that they make' approximately a line contact when engaged. Their conical surfaces are preferably roughened, for example by knurling. Preferably this knurling is in the form of definite iiutes, teeth or ribs, the teethof the roll I9 sloping upwardly and to the left, as viewed from the front of the machine, and the teeth of the roll 20 sloping upwardly and to the right when similarly viewed.

A Work hold-down 2l (Fig. 5), of crescent or shallow U-shape in plan View, is arranged so as partially to embrace' the front roll I9. The under or work engaging surface of this holddown 2| is preferably substantially at the levelof the lowest point in the bottom edge of the roll I9. A bracket 22, secured to the carriage I6 for vertical adjustment, supports this hold-down 2|.

Preferably a vertically thin, xed wiper, presser or guide member 23 (Fig. 4) is arranged to underlie the rear roll 20 and to extend forwardly substantially to the bite of the rolls I9 and 20. This xed wiper bears against the marginal material of the upper at a point substantially in the vertical plane of the axes of the two rolls, and approximately at the level of the upper surface of the sole element S. The part 23 is carried by a bracket 24 secured to the fixed fra-me 3.

A vertically movable slideY 25 (Fig. 1). is.

mounted in guides 26 carried by the left-hand side of the frame 3, the slidebeing urged downwardly by a spring (not shown) whose tension may be adjusted by a screw 28, the downward movementof the slide being limited by a stop screw 21. A'bearing bracket 29 is attached to the lower edge of the slide 25 and is adjustable from front to rear, respectively, on the slide.

A wiper shaft 3i) turns in an elongate bearing 3| forming a part of the bracket 29. An elongate rotary wiper 32 is fixed to the forward end of the shaft 30. This wiper has a truncated conical body portion of circular transverse section and has its larger end in the front. A helical rib 33 projects from the peripheral surface of the body portion of this rotary wiper. Preferably the edges of this rib are slightly rounded to avoid cutting the upper material.

The rear end of the shaft 30 is c onnected by a universal coupling,l (here shown as a form of proximately 1/2" at its forward end, and with a taper of approximately that is to say, a tan- .gent plane to the periphery of the body makes .an angle of 5 with' theaxis of the roll. These dimensions are given merely as examples and Without limiting intent.

The wiper roll ispreferablyy arranged with its axis substantially parallel to the vertical plane defined by the axes of the shafts I1 and I8, and is so located that its peripheral surface is substantially tangent (Fig. 5) tothe lower portions of the inclined peripheries of the feed rolls 'I9 and.20. ',I'he forward end of the wiper roll 32 is so located as to overlap the bottom of the shoe being 1asted, and is .preferably at least as far for- Ward as the tangent plane to the most forward pointA of the front roll I9, preferably extending from 11g" to 1/8 forwardly of said plane. The

helical rib 33 is of such pitch, here shown as lefthanded, and theroll is rotated in such a direction, here shown as clockwise as viewed from the front, thatthe rib acts to urge the lasting margin of the shoe ina forward direction, that is to say, inwardly over the edge of theshoe bottom. Preferably, the axis ofthe wiper roll is inclined upwardly and forwardly, for example, the axis may incline to the horizontal atan angle substantially equal to the `angle. of .taperof the roll.

A bracket I4 is adjustably secured to the forward partof theframe 3, andthisbracket supports a downwardly directed nozzle 35 having its lower end spaced a short distance, for example V4", above the plane of the upper surface of the roll '20 and with its axis substantially in `thi? transverse plane of the axis of the roll I9. This nozzle 35 (Fig. 1) is connected to a supply pipe 36 provided with a control valve 31 which is supplied with combustible gas (for example, illuminating gas) from a suitable source. Preferably, the nozzle 35 has air inlet openings 3-8 to insure proper combustion.

In operation, the gas issuing from the lower end of the nozzle 35 is ignited and produces a hot jet of flame indicated at F (Fig. 3). This flame jet F impinges upon the periphery of the wiper roll 32 and, due to the rotation of the roll, tends to follow the roll around, thus effectively heating the roll and to some degree acting directly uponthe upper surface of the wiped-in lasting margin. In Figs. 6 to 10 inclusive the operation oflasting. the platform cover or wrapper of a California type shoe is shown by way of example, but the apparatus of the present invention is intended to and is capable of lasting the uppers of conventionalA shoes, such as ordinary cement lasted shoes, and the operation, as illustrated in Figs. 6 to l0, is merely by way of example and without intent to limit the scope or utility of the invention, it being obvious that in lasting a conventionalshoe the lasting margin of the upper will be entered between the rolls and subjected to up-drafting and in-wiping stress in substantially the same way as the platform cover or wrapper of the California, shoe illustrated in Figs. 6 to 10.

In the operation of the machine the operator may, if desired, although it is unnecessary if he be suiiicientlyskilled, separate the feed rolls (Fig- 6.) lby the. operation of the carriage-actuating treadle so as to permit a. portion of the margin M of the platform cover to be entered between the rolls. The exposed bottom S of the shoe isbrought into contact with the lower surface of the hold-down 2I (Fig. 7). The carriage I6 is then permitted to move backwardly, and the margin M is iirmlygripped between the feed rolls I9 and 20 (Fig. 8). By reason of the shapes of these rolls and the inclination of their` shafts in the direction of work advance, the rolls tend to progress .the work from right to left, as viewed iniFigs. 2 and. 9, and at the same time they exert an upward component of stress which stretches the. platform cover material snugly about the shoe bottom'. As the marginal material, thus upwardly stressed by the rolls I9 and 20', escapes. .from between the rolls as the shoe advances, the marginal material M is engaged by the helical rib 33 (Fig. 10) of the rotating ywiper 32 and is thereby stressed inwardly across the edge of theshoe bottom and is pressed firmly down against the exposed surface S of the shoe bottom. Assuming that the inner surface of the margin Mand the exposed surface S of theshoe bottomhave previously been coated with cement (Fig. 9), the operation of the wiper roll firmly presses. the marginal material into adhesive engagement with the shoe bottom (Fig. 10). In accordance with the present invention as above described, the wiper roll 32 is heated, and the heat thus applied to the lasted-in marginal material tends to set the material in its wiped-in condition, it being well understood that the application of rheat to leather tends to set it and cause it to'become relatively hard and inelastic.

Furthermore, by the use of the heated Wiper roll, it is possible to employ a cement for uniting the marginal material to the shoe bottom which only becomes adhesive in response to heat. Thus, cements of thermostting orthermoplastic type v'the'rmosetting type.

. One desirable angle of inclination ofthe of the shafts Il and I8 has been suggested, as

maybe employed. Such cements have certain advantages, in particular they may not have any appreciable tackiness until exposed to heat. Thus, a coating of sucha cement upon the marginal material and shoe bottom will not in any Way interfere with the proper updrawing and inwiping of the marginal material by the rollsv I9 and 20and wiper. y i As illustrated in Fig. 3, the nozzle 35 is preferably arranged slightly to. the right of the vertifcal plane of the axis of the wiper roll 32, and

when so arranged the flame F tends to follow :around the periphery of the roll 32 and into` direct contact with the marginal material. Thus, the heat effect is accentuated, the marginal material being heated even before actual contact with the roll 32, thus assisting in a rapid activation of the cement if the latter be of the thermoplastic or Whilev an open flamehas been suggested as the means forsetting the wiper roll 32, it is obviously Within the purview of the invention to heat the roll 32 by other means, for example by an electrical heating unit, steam or otherwise.

axes

Well as a desirable taperlfor the feed rolls, but it is to be understood that the-invention is not necessarily limited to'the precise anglesthus suggested, but that variations in these angles may be made Within the scope of the invention,

.for example to accommodate work of different types. referred to as a shoe lasting machine, it is capa- Although the machine herein described is in made to a shoe-lasting machine; to a 1a'st;

to a platform cover; and to the lasting margin, these terms are employed in an illustrative sense and with reference to a chosen example, and are to be interpreted with the understanding and not as limitation upon the use of the invention nor upon the scope of the claims.

It is to be understood that the particular means for driving the operative parts of the machine are shown merely by way of example and that suitable modications in the shapes or arrangements of parts and the substitution of equivalent parts for those shown are to be regarded within the scope of the invention as definedy by the appended claims.

I claim:

1. In combination, in a machine forapplying stretching stress to flexible sheet material, a rotary Wiper having a tapering body of circular Y transverse section fixed at its smaller end to a supporting shaft, a helical work stressing rib projecting from the peripheral surface of its body portion, and means for heating the larger end portion of the Wiper. e

2. In combination, a lasting machine wiper, designed to lay the lasting margin of the shoe upper down upon the bottom of a sole member, said wiper being arranged to extend inwardly over said lasting margin and comprising an elongate body portion and a helical work-impelling element embracing the body-portion,'said workimpelling element being operative uninterruptedly to urge that portion of the lasting margin with which it is engaged ina direction substantially parallel to the axis of the helical element, the

body portion of the wiper tapering in diameter and having its smallerfend at the rear, support- =ing means fixed to the smaller end of the Wiper,

and means for directing a hot uid jet against said helical element.

3.. A machine for lasting shoes which includes a pair of oppositely tapering frusto-conical rolls for gripping the lasting margin of the upper and for stretching the upper snugly about the last, an elongate, rotatable Wiper having a helical Work-impelling element operative uninterruptedly to engage said margin after it leaves said gripping rolls and uninterruptedly to impel the margin inwardly transversely of the edge of the last and to wipe the margin down upon the bottom of a sole carried by the last, a rotary drive shaft for turning the wiper, said shaft being coaxial with and rigidly kconnected to the rear end of the wiper, the shaft constituting the sole support for the wiper, the forward end of the wiper being free, and means for directing a jet of hot gaseous fluid against the forward free end portion of the wiper thereby to heat the wiper.

4. In a lasting machine of the kind having upper gripping means, including a rotating workengaging roll, designed to stretch the upper snugly about the last and wherein the point of application of the stretching force is progressively shifted relative to the last along the periphery of the last and having a tapering rotating Wiper provided with a helical work-engaging element whose point of effective engagement with the Work is progressively shifted relative to the last concomitantly with the shift in the point at which the stretching force is applied, characterized in having means for directing a jet of flame against the peripheral surface of the wiper.

5. In a lasting machine of the kind having upper gripping means, including a rotating workengaging roll, operative to stretch the upper snugly about the last and wherein the pointof application of the stretching force is progressively shifted relative to the last along the pef riphery of the last, and having a 'tapering ron the last concomitantly with the shift in the point at Which the stretchingforce is applied, characterized in having means for directing a jet of flame against the downwardly moving side of the rotating wiper. Y

6. In a machine for applying stretching stress to flexible sheetmaterial, gripping means, including rotating, frusto-conical work-engaging rolls, designed to grip the margin of the sheet material and to stretch the vlatter and wherein the point of application of the stretching force progressively shifted, and having a tapering rotating wiper provided with a helical Work-en- -gaging elementwhose ypoint of effective engage- -ment with the sheet material is progressively shifted concomitantly with the shift in the point at which the stretching force is applied, and means operative to apply heat to the sheet ma- `rterial as it is released by the grippingmeans.

' Y7; A vlasting machine having a rotary shaft of a solemember, the wiper having a body of circular transverse section and a helical Workimpellingjelement, the Wiper extending across 'the edge of the sole member of the Ashoe being i lasted vand beingoperative progressively-:andi uny --firxterrupte'dly :to "gapply lvin-wil'ning .stress u' to ithe 'lasting margin, lthe lfhelical workq'engaging -elefment tapering indiam'eter iwith itslsmaller `end 4iat-the rear,1 and 2a nozzle rarranged to deliver Ta jet of heating fluid against ithefperipheral Lporlitio'nicii the wiper which rstifengagesthef upper.

J8. Y A- machine for applying s'tretchingistress to lltlelxiblelsheet materiaLinclut-ling front and-rear, ppositely turning ffr'usto-"conica'l '-rolls *whose -l-axesare parallel and ncl-i-neddownwa'rdlyfin -the `direction of advance 'lof the work,y said rollsbein'g 'o'peiative'to grip "'-thers'heetmaterialand while vfstretching fthe latter concomitantly advancing "fthe work uninterruptedly,` a? rotating helicalwip- "ing element operativefuninterruptedly to iengage "direction f 'advanceif` the work, said rolls'being' operative to'grip' the lasting margin vof the Vupper and while stretching the upper snugly about-the `last concomitantly to'advance the shoe uninter- `ruptedly, andV having an axially elongaterotary wiper having afperipl'ieral;v helical work-impelling element;v the wiper-being solocated that its worklmpelling elementengagesfthe-lasting margin as the latter escapes from the`bite of thel fee'drolls and thereby urges that portion of "the I margin with which 'it is engaged in a Yforward'ldirection f' substantially parallel fto" the axis' of the wiperja rotary drive'shaft"for"turning the wiper, said shaft being coaxialv with and 'rigidly'lsecuredf to the rear 'end' of" vthe wiper and constituting `Vthe sole support "for"the'wiper, theforward endof margin of the' upper' and while stretchingf f the upper snugly about' the'la'st concomitantly toadvance the shoe''ur'iin'terrupte'aillyV andhavingU wip- Aing means operative 'toerigage"the'la'sting margin after the"1atter'leavesfthe grippingmea'ns, and means for directing a "ilame F against the "wiping means for heating'the'flatterf'said' wiping 'means being operative 'uninterruptedly to impel the lasting margin asit' escapes "fro'mthe bite 'of fthe 'feed rolls inwardly across' the'edge of the 'shoe bottom.

11. A` machine forl'lastingt shoes; 'saidi IAmachine being ci.' the 'kindfwhich 'includes' a-r'i'alr of oppofsitelyturn'ing 'frustolcon'ical rolls whose axes' are Vparallel and inclined downwardly in' the'fdirec- '"tion' o'f advance 'fo'f the" work, isaid rolls A"being operative to grip thellasting margin'of the upper land while stretching 'theuppersnugly about fthe -`last* concomitantly to advance;the shoeuninterruptedly', and having-wiping'fmeans operative fun- A int'en'uptedlyf'to urge `thevmargin` inwardly 'across B :the dge 'zot the-sole member `after-:theVinar'in VVleaves thevgripping pmeans, vand means Ytorbelli- J'ingithe margin ofthe sole A immediately belote -itsis 4operatively yengaged by the wiping meam.

l2. Av machine -fori-lasting shoes, said machine being otthekind which includes `front and rear. oppositelyiturning .rusto-.conicalfeed rolls whose axes are parallel and inclined downwardly inzthe direction of advanceaf the'work,` said rolls being operative to grip thelastingmargin of'the upper fand whileV stretching '.the upper.;snug1y A about fthe last, concomitantlyto advancethexshoe uninterruptedly, heated wiping meansiior'wipinginithe lasting margin, Land -.aA workfhold-down :of substantially VU -shape whichzpartially embraces;` the vfront feedroll with its under suriacesubstantisl- "ly at 'the levell ofthe 'lowest point of the liront feed `roll.

13. A'machine for 'lastingy shoes, said 'machine being of the kindfwhich includes front and rear.

oppositely turning frusto-conical rolls whose axes vare parallel and inclineddownwardly in thedlrection ofadvanceof the work, said rolls'being operative to grip the lasting margin of the upper and, while stretchingthe upper snugly aboutthe last, concomitantly to advance the shoe uninterruptedlyfconstantly yrotating means Afor wiping in the lasting margin, and a nozzle for directing heating fluid Vagainst the operative .portion -oi said wiping means.

14. A 'machine for lastingshoes,said machine being'of the kind -which includes front and rear,

'oppositely turning frusto-conical rolls whose axes are parallel and inclined Y downwardly l in the direction of advance of the work, said rolls being operative to grip' the lasting margin of the upper and, while stretching the upper snugly aboutthe last, concomitantly to advance the 'shoe uninterruptedly, means forA uninterruptedly impelling the lasting margin as it escapes lfromlbetween said rolls inwardly across the-edgeoiV the shoe bottom,v and a nozzle` for delivering -a heating fluid. medium against the marginalmaterial asjit is so impelled 15. A machine for lasting shoessaid lmachine being of 'the'kind which includes front and-rear, oppositely turning frusto-conical rolls whose axes areparallel and inclined downwardly in the di- Yrection of advance of the work, said rolls being operative vto grip the lasting margin of the upper and, ,while stretching the upper snugly about the last, concomitantly to advance the shoe uninter- `ruptedly, `a fixed member arranged to engage fthe marginal material at .a point immediately below the bite of said rolls, constantly rotating `:ta'ckyas it is .laid down upon .theshoe bottom by the `wiping means.

16. A machine for applying stretching.stress to exiblesheetmaterial, including front and rear, oppositely turning frusto-conical rolls whosevaxes are parallel and inclineddownwardly inthe direction of advance-of the. work, said rolls vbeing voperative -togripthe sheet material and, while stretching the latter, .concomitantly toadvance the work -continuously nand -uninterruptedly, a

-wiper elementoperative tofengageithe sheet ma- ".terial as it leaves thegrippingfmeansand tostress -said :material in .a Idirection approximately; `per- Y fpendicular ito the .ffdirection' -,of 4the stretching force exerted by the rolls, means for actuating the wiper element, and means for directing a jet of ho-t fluid against the work-engaging portion of the wiper element.

17. A machine for lasting shoes, said machine being of the kind which includes front and rear, oppositely turning, oppositely tapering, frustoconical feed rolls Iwhose axes are parallel and inclined downwardly in the direction of advance of the work, said rolls being operative to grip the lasting margin of the upper and while stretching the upper snugly about the last, concomitantly to advance the shoe continuously, means for directing a jet of hot gaseous luid against said marginal material as it escapes from between the rollsyand means operative to work the heated marginal material inwardly over the last bottom.

i8. A machine for applying stretching stress to flexible sheet material, including front and rear,

oppositely turning, oppositely-tapering, frustoconical work-gripping, feed rolls whose axes are substantially parallel and inclined downwardly in the direction of the advance of the work, whereby the rolls exert an upward Stress upon the material, the forward roll tapering upwardly and the rear roll tapering downwardly, an elongate 10 rotatable wiper, a rotary drive shaft for the wiper coaxial with the latter and rigidly secured to the wiper, said shaft constituting the sole support for the wiper, the forward end of the latter beiner free, means for heating 'the forward, free end portion of the wiper, a hold-down device to limit upward movement of the work in response to the upward stress exerted by the rolls, and means for rotating the wiper.

JACOB S. KAMBORIAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,124,957 Russell Jan. 12, 1915 1,142,550 Brock June 8, 1915 1,223,363 Bowen Apr. 24, 1917 2,028,245 Pym Jan. 21, 1936 2,326,193 Baker Aug. 10, 1943 2,397,369 Quinn et al Mar. 26, 1946 2,438,917 Kamborian Apr. 6, 1948 2,445,845 Baker 'f July 27, 1948 2,455,694 Miller Dec. 7, 1948 

